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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3a50144d583b687577ed6eb01373e3eb8347d7cdd2b46846e7a08adf215b444' 
  AND token = 'CHu4r4XYkKPn7npyuofRJfuSXEN7xO4jclpPRqwgN7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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