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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '483c56a9de412f9b5de363bec9a9b0084ab1760b205a9d32985ce4c9e090474a' 
  AND token = 'P0ZbkMShPHDLFWqxXxX7Aw8nCzGZtkiT0q4LRYq+2d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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