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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61f978a6e32bab60bfc686fea1980ef80cafd03056741ac05e5d96a10ffb89e0' 
  AND token = 'RXdsY7LnitDozyZNXgzRapX44y7Ga/1+mE1/W20zHtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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