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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbcda11b1dbcd7d8353311f36120aa6db4c3a7d56178a9a2cf474112e5ceeaaf' 
  AND token = '3caqzCJtf5vyCeLuqffObnT1BWZG0svNNofWGndcSmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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