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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '689fff5e30a78b0faf9c9ff2db507dc349a98e2d337846f3d8f9cc2c4457e775' 
  AND token = 'rhv1qE3/MrSqJck+5twNenUns/Syu0+huqFKuysTufk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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