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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5700847de4910a89fa1636a3b98ab0840029af62afab922133c07a3061118403' 
  AND token = '14qhd5PpdONWh+xHjXw5PoeYhYp8+iI6cMvnsnp86Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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