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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dab22a7fbe9acd78e03e0a6981d844ff8f054e789b87b1d62518534180058bb' 
  AND token = 'a55xtsyJvbmIYZTLhqzUf6ybpmJE70RcWZMy2RTdIeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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