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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd09962df5775d2e9892fedf54eab32274ad024e0c95e5b4cc4da2b7c455b3eab' 
  AND token = '/2k7/Ykvwl6Rfna2rYe0RSyv5fFKmDyUh9OyJwK/YTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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