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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb90922f0f7e8265007b895d4ae5ae174971410a7e05bea0dc0165cde0ea22bc' 
  AND token = '9pyc3UFK2UNz1LwCd/W/HibMbeuJ1egwFwkLc0eQIiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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