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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e776592a8949ffa4d8d59447f67a380a469aef740a0d3cf16efb75d968e6e02e' 
  AND token = 'P9vsAfxkPmUGK2kTT7cprTw0twFq633QvEHEAZe/OfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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