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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '533f32de5eb87223d728ae50c7228bd01934da00e16f7467d3af32e988542b7f' 
  AND token = 'GIhRM/blHGioW7Ur9kvWgCx19TCiDtUx+h21ABm9Djg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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