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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2958dccf792a56af90e04c05913c6c062f674de2d7ca63d76e6c8a7e54625543' 
  AND token = 'V13uGka1zmE2uDru230IZpE1erciKGWnYpm4i+GX+xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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