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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eccbcec251cb4ac38086f89d7fb88dd1a0302bbb7af0be4b187e8f696ce18ca' 
  AND token = 'w5ibbzIh1xCQv+3lmcYBCpHm/j+ZOrILld2MXsW9OHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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