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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d709255e653517864596be6b9a70158d15d5ec37bcdd9ebf173220af95bc88' 
  AND token = 'zmduMgiGux79tIi6F/8yL6Y5PasHRb5G8I9pzHLjBpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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