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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc5d2fd34dc8cf23a105424ed6c25ff3d718fd981c9eeaaf1c0c8096c7d541ee' 
  AND token = 's2k1IsoMr0vCjG7M/HUEqT9ePKuwLkuSIU3Ikd4QNAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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