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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa433adaff5005ba8faaa7474552e6c4e8da67bd6103eb98a4c760b4a896e7b8' 
  AND token = 'JDIGJlueXsXU7twQud5R+Hq6YScw01j7GzPd+AReegg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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