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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb0ca5b60611ce13ec6a221561e38f85f5e3f644d9035af0551b469b389d68b2' 
  AND token = 'BJlgWzD46AFUKdcoxX5IpWxfXYpUiddqfop7Jxq5D4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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