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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f65771f6dbcec00728fd7b8dad80c1c112575f0ad05e5cfbc64225d6a034754' 
  AND token = '75NcOjHAdBgfyEsaqknqetrteX8qiXr3kvV0scvKJxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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