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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6ed36cddafc594ff38ac4252b7e7b67ad41ddf03546de96aa88f2d66c0903c7' 
  AND token = '/ctd2e6WEuwTb7icpfaXLWS48e6gyo93BNwh8lAmlms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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