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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '997e38fbb1659e39f0207635d009ca8e476db98a139d86b425caeb1b536cea81' 
  AND token = 'vSuWaMXs94bpM8PNPWBQP0QmkBV8YrFkPURAxTbwytw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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