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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6440f832c64ac241f79402a32513e01cce6ed5463b6b83543ea76328419ae602' 
  AND token = 'Fm0V/Flldu9dVCIzdQNBabpeWnp16GGspqEkEGdz/wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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