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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '131230145db1aa2d527eeee0b0a9f90ef936732319a82405421093c2dc5120ac' 
  AND token = 'gqiVbZxilqsdNBg5Ednhc/MY3ILbGAYOP0C1g8CzLbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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