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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13940b50c9369f05350cf6edc2c6377b60eda196f61d76b898b3ae75480a5258' 
  AND token = 'faWW4HQigaD4S3/HO9HE6Ey9T4FoDv6bGY9dLAXB88A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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