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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bea11a5a3601ad8d5822f9011eb296458b87870da31216edb86b9e16682001b' 
  AND token = 'wEe2o4p29LDpa4AmFGmzlf+EUKb91a2yEwYvmxu/Zbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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