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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d3bd0ddd0c7e877dc8de4ec7488fb691ff689e4d5def7141cd499645ad90eff' 
  AND token = '9k1Y3nEmmK9xDNtUzk00QMZCkeBX0NGgG+3x0tSA2vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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