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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72ce7bf9fab45a88dbaec08b4d84cbaced61ae674f1e7a9eab8b0ef0abaa7195' 
  AND token = 'rEM+c3tTk3qm6hKdnMq5KdvgWf54nJqu84I+sotthnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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