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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f2d01b0322dc355a267c3b92ad7530f6a537ca1f0f8aa4f7105f7ca79bb810e' 
  AND token = 'wIIqhagaezPLk5ozfl3RJT8xlV4urRdh3rQ23s4FjRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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