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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96364c00d8bd221da08a415c0dbbf1a63cc928b86f0f585bb9eefed8ae89c40b' 
  AND token = 'MselYzec0nUxTZaMYiThg4J3VwLR+KI09VPWTVjzah4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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