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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8ccf04142ac891d1e6f4052b7db42bf93e7bc6d98b67c2eafa4587174de84b3' 
  AND token = 'lZqjYIyors9wwMa6L91WtjAXr2U/iQEpHmgEq4115LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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