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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7eea5f287fcfaba864ac046a482f43548f989988c77c067ede5fe286121742a' 
  AND token = 'lWbwcjA+XPWtulxMkg4A3fzCEAOnqGmeFLNPI69gfN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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