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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '566c94d117505ec2d7a9effc4e7de5e2fc621c0c71c2e82c072d2ceff0304ee1' 
  AND token = '0Qft3JNF5yJG9tbxNRnFg0YbmaBYeuS07bl6IOh5Krs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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