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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae53d2f55026a9b708202a40ff4f0b3f2490050a7001d9fda09a6f45f00da353' 
  AND token = '3OS1dI6lZFVCeQPGR3GTFlONI1nGWSY0fTnYZHB/ubs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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