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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '376a8ca9eb70dab2b36fe9147f90559cccafe8f00c163f4054b84dbe2b3aab76' 
  AND token = 'IaxsGDVw6V/1cIeSk82FuhQZnU7tp6Jev/jVBjbMTw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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