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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '992f722ee64d94f103585c7e121f895207b04f7d6619b376df2a9dd73259e1ff' 
  AND token = 'rtsEgMrzqXi4aWAmB5FlQUqOy+A7IqCf0bku3yZF17A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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