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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08d83637bd6d30ab7a472b4cd85561c0cd9abb301813f18b85495468341c5feb' 
  AND token = 'LGr2R6JhNBl1yDB757cYM2gBADrB9l87iq7sdT75k48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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