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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7dc5c0440d6d78559c39bd2b2c3eb0c7de9caa831d539f9edf3580e314bd1bd' 
  AND token = 'FqB6JdUwODUWHIIBuNdcTT4iivgzQaH++ZKRbUZWjR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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