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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '810fb2859ca49276ba3a98dcc765efab5ea91f108ce118605d2b0575da55cf4e' 
  AND token = 'IfvDiRaJ/pbt9HTjdfaymcExd9y0CbCaASpvumu1b6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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