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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '869000bd1a63eb5eb0ed746ee9d99d59d649a4fecb3a711aaf610cb405975043' 
  AND token = 'N2UkDe4JyoBmd0Jh4kZvUlPSDly0TuTdcNPY2ObTS9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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