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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed032365522d6215ae181a9c835d6958a6f4a47aa89f5013b2d86d17d08fec4f' 
  AND token = 'e+cnRakXss22MsT2Y4z814fIXG6GfaNGwJv3ttUe098=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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