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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee525f5a8f2ee1f9b43530e6c6c4e5e9bbf83154d96867c6eace3f81cc9f2a46' 
  AND token = 'kXMpA3qyEjJ36+rI8/kzE9z1XvxpESpyyzcRx4h10os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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