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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b5a206594ad319fd9f9abd9d89208ab04d6ee0ec1fd2e5718e7a701d9dfb1c4' 
  AND token = 's1Sz1aaLk33ZSTyOZ4pJ9HB6rv2Z1S38hWr8m2s2ax8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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