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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9c62537ad8dcb62869c09c5cea4a5cb2ce78149c3413732ad09d28fcb7a72d9' 
  AND token = '0KgR0B4YER3H66cxsRQI23k1DkHdHFokOkY4nUHPOxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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