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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12c60087470dd5087b817d089391e95d4ce11ecf41460896103a569f91852bbc' 
  AND token = 'ql9k6whLxoD+b8xf9yzXFvYs5Qo7XHQIMxzfoedonR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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