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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc5eafe230e6625f5ffd1610f1935c45e5a60962fcf50579e5c0573e4191bcb1' 
  AND token = 'hceh5jxLydC8PPk1wRUlBWrRklzmXV8Nc3CHGkLDpfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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