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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68946f889c9a7f4ec640b91586d2bb254cc343bde2d775e70e298cb984aa26c1' 
  AND token = '+fTXR3ixlptrCt09yt+fbOJSp5tvyl5Wfw/3jf92kKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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