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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '149d8f8602bc61c25c1f2d667b80e8c7c1a65e51885b006695f97756ff6d9286' 
  AND token = '3YflERYxX89RocSmZbCsW3EkwdNQt6b08oxUClXUFxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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