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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '648451906e290e0fd93a4549a58eb3e0750e9303e4138f1ea42f0b5b0c76b168' 
  AND token = 'hkdUcdJbZKWoGBUpvzrvi3MgQYJuFn8bqWbdtifLsBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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