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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d61b97e16dc987b1c7bb71dc45a62e6a0b03af4d121bb46ed0ca2056905440f' 
  AND token = 'izvp/axg4Q5Q3WQ+sA0XcJ9xZ7fe9whzEPanDgJ4EzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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