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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '005bd4f3346601d78342e401e6ffe5f51038482a9c9b1ca04a9f2c9d123e4c12' 
  AND token = 'CMgyV6iU9/AIUB4o7lDsEzUU5JjgkENL22Ld7GTRNq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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