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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad34c57bb9ea58a9a1d6ba343b1e634bf1032363c49e7cbbae0d860b7f323f2b' 
  AND token = 'eb3pHyIXMFF239FzNIznHjWPHGcdcIysgKIcp40CCOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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