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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d0f50b4ff065b3a4cce4bf30ab2121fec71f2a56a94135c3f8b7ab235887427' 
  AND token = '27my7vxiX96P/9+NxTN6Y6Z08HmB13/M4y2AIXviuvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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