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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef5898ddbebce2eb901e70980ed593d163d58f8ca4ea87de9476a5695b781be6' 
  AND token = 'hbx414FBo1EuYVw2pUIs9E5u6wvaYsW0QTmztf4Ptmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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