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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '505e15dc5fd8d75d2ae1245072ca4738a9af5252032211e45bf3643ad22a482b' 
  AND token = 'B98gQ343byAcQgWRODZTVeJv5amA17pplQ8Trz5t1TE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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