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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '146619186e4e45236b143af67280afd49739b576a97753d5966ae48e16924385' 
  AND token = 'w1pTakXE4RMYCpBu/eWBozCR9RX6Q1FTjehSonj4dbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}