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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed7b58c5759f36ccf7c4d4acfc4bb4c2c55434683c9ea0ff0c1af5cb78a10996' 
  AND token = 'LujckRwVV5knjaJd4MF1VUfvr2ez2ZxS8KX23EXStuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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