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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9127a2fd0dd7eb1fd1b26ab7ac1ed2b58ecbf7c75d5555d02f65ab949dbbae66' 
  AND token = 'Fx3xPKvOX9Ib+VINyRpkmj4DS4xpMcU/FMjFxUtXqGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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