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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038c21089939883cc58ae2a24c16291591c94891a77dca470ed1da0214df5b52' 
  AND token = 'kYjqQUctv6rmJgcGzFuSgsmaM1Yuzti2nF83Vbo4PEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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