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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef0b74b9d9ea20f460c0bf3a7ea2e59b371e3dcb692201d8468d2d7f23ac7ea4' 
  AND token = 'EYX+/dyH0eWgBBXL9uBSpj7XTPoiVC4kfxSGcypnJXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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