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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a2fd2e84573f68004db7f4152a1b31ed2084a25c23f2749d44e8ddbbe39e256' 
  AND token = '7ALtndjMhuqTGKWkyG+PX0I+0NC0J0MFo7CCkGe9tmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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